What Does P0347 Mean?
The ECM has detected that the camshaft position sensor A signal voltage on Bank 2 is below the minimum expected threshold, typically reading below 0.2V when a valid signal should be present. This low input condition indicates the sensor signal wire may be shorted to ground, the sensor itself has failed with a low output, or there is an open in the 5V reference circuit leaving the signal wire pulled low through its internal circuitry.
Common Causes
35%
Short to ground in the CMP sensor A signal wire on Bank 2, often from harness chafing against engine brackets or valve cover bolts
30%
Failed camshaft position sensor A (Bank 2) with internal short causing signal output to be pulled to ground
20%
Open or high resistance in the 5V reference supply wire to the Bank 2 CMP sensor, causing sensor to lose power and output zero volts
15%
Water intrusion or heavy corrosion in the CMP sensor connector creating a low-resistance path to ground through moisture
Diagnostic Steps
1
Disconnect the Bank 2 CMP sensor A and measure voltage on the signal wire from the ECM side with KOEO. If voltage rises to reference level (approximately 5V), the sensor is shorted internally.
2
With the sensor disconnected, check for continuity between the signal wire and chassis ground. Any reading below 10K ohms indicates a short to ground in the harness.
3
Verify 5V reference voltage at the sensor connector. If missing, check for an open in the reference wire. Note that the 5V reference is often shared with other sensors; if multiple sensors have issues, suspect the reference circuit.
4
Inspect the Bank 2 CMP sensor connector for water intrusion, corrosion, or oil contamination. Check the connector seal and apply dielectric grease after cleaning.
5
Trace the wiring harness from the Bank 2 CMP sensor to the ECM, looking for pinch points near engine mounts, valve cover bolts, and ground straps where insulation damage is common.
Estimated Repair Cost
$75 - $350
Parts + labor, varies by vehicle and location
The ECM has detected that the camshaft position sensor A signal voltage on Bank 2 is below the minimum expected threshold, typically reading below 0.2V when a valid signal should be present. This low input condition indicates the sensor signal wire may be shorted to ground, the sensor itself has fai...
The most common cause of P0347 (Camshaft Position Sensor A Circuit Low Input (Bank 2)) is: Short to ground in the CMP sensor A signal wire on Bank 2, often from harness chafing against engine brackets or valve cover bolts
Typical repair costs for P0347 range from $75 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A stuck-low CMP signal causes the ECM to lose Bank 2 cam position reference, potentially resulting in engine stalling or inability to start. Driving without valid cam position data risks misfires and catalytic converter damage from unburned fuel.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0347 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Timing / Variable Valve Timing
Difficulty
Type
Generic (SAE)
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